@article{9d31cbcf1b7141b7b2b36628fbfe9b8b,
title = "Solar and meteorological influences on seasonal atmospheric 7Be in Europe for 1975 to 2018",
abstract = "Assessing the transport of natural radionuclides in the atmosphere provides a powerful tool to study air mass circulation. Here, we investigated the seasonal atmospheric distribution of the naturally produced 7Be in surface air over Europe between 40° N and 68° N during the period 1975–2018. The results suggest that the inter-annual variability of 7Be reflects production rates of the radionuclide induced by solar modulation of cosmic rays. Further analysis of the meteorological influences indicates that the meteorological influences on 7Be concentrations are geographically and seasonally dependent. We found that, in general, the tropopause pressure plays an important factor influencing 7Be activity for winter and spring seasons while the sea level pressure and temperature are more dominant during summer and autumn seasons. The combination of tropospheric production rates and meteorological parameters explains 24%–79% variances of the seasonal 7Be activity. We further applied a three-box model to study the influence of stratosphere-troposphere exchanges on 7Be concentrations. The simulation supports that the seasonal cycle of 7Be in Europe is controlled by two main factors: the changing height of the troposphere (seasonality of the tropopause height) and seasonal variations of the stratosphere-troposphere exchanges.",
keywords = "Beryllium-7, Meteorological influences, Solar modulation, Stepwise regression, Stratospheric intrusion, Three-box model",
author = "Minjie Zheng and Jesper Sjolte and Florian Adolphi and Ala Aldahan and G{\"o}ran Possnert and Mousong Wu and Raimund Muscheler",
note = "Funding Information: M. Zheng is supported by the China Scholarship Council (CSC) under grant CSC no. 201606710087. A. Aldahan acknowledges the UAEU through the UPAR funding. This work was partially supported by the Swedish Research Council (Dnr:2013–8421, grant to R. Muscheler). F. Adolphi is supported by a grant of the Swedish Research Council (Vetenskapsr{\aa}det no. 2016–00218). J. Sjolte is supported by the strategic research program of ModEling the Regional and Global Earth system (MERGE) hosted by the Faculty of Science at Lund University. M. Wu is supported by National Key Research and Development Program of China (2016YFA0600204), the National Natural Science Foundation of China (41901266) and the Natural Science Foundation of Jiangsu Province (BK20190317). The authors would like to thank all the EU Member States for having sent the data to the REMdb, and the NOAA/OAR/ESRL PSD, Boulder, Colorado, USA, for provision of the NCEP Reanalysis data through their web site http://www.esrl.noaa.gov/psd/. The authors also acknowledge the E-OBS dataset from the EU-FP6 project UERRA (http://www.uerra.eu) and the Copernicus Meteorological Change Service, and the data providers in the ECA&D project (https://www.ecad.eu). Funding Information: M. Zheng is supported by the China Scholarship Council ( CSC ) under grant CSC no. 201606710087. A. Aldahan acknowledges the UAEU through the UPAR funding. This work was partially supported by the Swedish Research Council (Dnr:2013–8421, grant to R. Muscheler). F. Adolphi is supported by a grant of the Swedish Research Council (Vetenskapsr{\aa}det no. 2016–00218). J. Sjolte is supported by the strategic research program of ModEling the Regional and Global Earth system (MERGE) hosted by the Faculty of Science at Lund University . M. Wu is supported by National Key Research and Development Program of China (2016YFA0600204), the National Natural Science Foundation of China (41901266) and the Natural Science Foundation of Jiangsu Province (BK20190317). The authors would like to thank all the EU Member States for having sent the data to the REMdb, and the NOAA/OAR/ESRL PSD, Boulder, Colorado, USA, for provision of the NCEP Reanalysis data through their web site http://www.esrl.noaa.gov/psd/ . The authors also acknowledge the E-OBS dataset from the EU-FP6 project UERRA ( http://www.uerra.eu ) and the Copernicus Meteorological Change Service, and the data providers in the ECA&D project ( https://www.ecad.eu ). Publisher Copyright: {\textcopyright} 2020 Elsevier Ltd",
year = "2021",
month = jan,
doi = "10.1016/j.chemosphere.2020.128318",
language = "English",
volume = "263",
journal = "Chemosphere",
issn = "0045-6535",
publisher = "Elsevier Limited",
}